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UnixFileStore.java
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UnixFileStore.java
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/*
* Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.fs;
import java.nio.file.*;
import java.nio.file.attribute.*;
import java.nio.channels.*;
import java.util.*;
import java.io.IOException;
import java.security.AccessController;
import java.security.PrivilegedAction;
/**
* Base implementation of FileStore for Unix/like implementations.
*/
abstract class UnixFileStore
extends FileStore
{
// original path of file that identified file system
private final UnixPath file;
// device ID
private final long dev;
// entry in the mount tab
private final UnixMountEntry entry;
// return the device ID where the given file resides
private static long devFor(UnixPath file) throws IOException {
try {
return UnixFileAttributes.get(file, true).dev();
} catch (UnixException x) {
x.rethrowAsIOException(file);
return 0L; // keep compiler happy
}
}
UnixFileStore(UnixPath file) throws IOException {
this.file = file;
this.dev = devFor(file);
this.entry = findMountEntry();
}
UnixFileStore(UnixFileSystem fs, UnixMountEntry entry) throws IOException {
this.file = new UnixPath(fs, entry.dir());
this.dev = (entry.dev() == 0L) ? devFor(this.file) : entry.dev();
this.entry = entry;
}
/**
* Find the mount entry for the file store
*/
abstract UnixMountEntry findMountEntry() throws IOException;
UnixPath file() {
return file;
}
long dev() {
return dev;
}
UnixMountEntry entry() {
return entry;
}
@Override
public String name() {
return entry.name();
}
@Override
public String type() {
return entry.fstype();
}
@Override
public boolean isReadOnly() {
return entry.isReadOnly();
}
// uses statvfs to read the file system information
private UnixFileStoreAttributes readAttributes() throws IOException {
try {
return UnixFileStoreAttributes.get(file);
} catch (UnixException x) {
x.rethrowAsIOException(file);
return null; // keep compile happy
}
}
@Override
public long getTotalSpace() throws IOException {
UnixFileStoreAttributes attrs = readAttributes();
return attrs.blockSize() * attrs.totalBlocks();
}
@Override
public long getUsableSpace() throws IOException {
UnixFileStoreAttributes attrs = readAttributes();
return attrs.blockSize() * attrs.availableBlocks();
}
@Override
public long getUnallocatedSpace() throws IOException {
UnixFileStoreAttributes attrs = readAttributes();
return attrs.blockSize() * attrs.freeBlocks();
}
@Override
public <V extends FileStoreAttributeView> V getFileStoreAttributeView(Class<V> view)
{
if (view == null)
throw new NullPointerException();
return (V) null;
}
@Override
public Object getAttribute(String attribute) throws IOException {
if (attribute.equals("totalSpace"))
return getTotalSpace();
if (attribute.equals("usableSpace"))
return getUsableSpace();
if (attribute.equals("unallocatedSpace"))
return getUnallocatedSpace();
throw new UnsupportedOperationException("'" + attribute + "' not recognized");
}
@Override
public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type) {
if (type == null)
throw new NullPointerException();
if (type == BasicFileAttributeView.class)
return true;
if (type == PosixFileAttributeView.class ||
type == FileOwnerAttributeView.class)
{
// lookup fstypes.properties
FeatureStatus status = checkIfFeaturePresent("posix");
// assume supported if UNKNOWN
return (status != FeatureStatus.NOT_PRESENT);
}
return false;
}
@Override
public boolean supportsFileAttributeView(String name) {
if (name.equals("basic") || name.equals("unix"))
return true;
if (name.equals("posix"))
return supportsFileAttributeView(PosixFileAttributeView.class);
if (name.equals("owner"))
return supportsFileAttributeView(FileOwnerAttributeView.class);
return false;
}
@Override
public boolean equals(Object ob) {
if (ob == this)
return true;
if (!(ob instanceof UnixFileStore))
return false;
UnixFileStore other = (UnixFileStore)ob;
return (this.dev == other.dev) &&
Arrays.equals(this.entry.dir(), other.entry.dir());
}
@Override
public int hashCode() {
return (int)(dev ^ (dev >>> 32)) ^ Arrays.hashCode(entry.dir());
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder(Util.toString(entry.dir()));
sb.append(" (");
sb.append(entry.name());
sb.append(")");
return sb.toString();
}
// -- fstypes.properties --
private static final Object loadLock = new Object();
private static volatile Properties props;
enum FeatureStatus {
PRESENT,
NOT_PRESENT,
UNKNOWN;
}
/**
* Returns status to indicate if file system supports a given feature
*/
FeatureStatus checkIfFeaturePresent(String feature) {
if (props == null) {
synchronized (loadLock) {
if (props == null) {
props = AccessController.doPrivileged(
new PrivilegedAction<Properties>() {
@Override
public Properties run() {
return loadProperties();
}});
}
}
}
String value = props.getProperty(type());
if (value != null) {
String[] values = value.split("\\s");
for (String s: values) {
s = s.trim().toLowerCase();
if (s.equals(feature)) {
return FeatureStatus.PRESENT;
}
if (s.startsWith("no")) {
s = s.substring(2);
if (s.equals(feature)) {
return FeatureStatus.NOT_PRESENT;
}
}
}
}
return FeatureStatus.UNKNOWN;
}
private static Properties loadProperties() {
Properties result = new Properties();
String fstypes = System.getProperty("java.home") + "/lib/fstypes.properties";
Path file = Paths.get(fstypes);
try {
try (ReadableByteChannel rbc = Files.newByteChannel(file)) {
result.load(Channels.newReader(rbc, "UTF-8"));
}
} catch (IOException x) {
}
return result;
}
}